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Rayan Programming Contest 2024 - Selection (Codeforces Round, Div. 1 + Div. 2)
6 days
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*has extra registration
→ Filter Problems
Difficulty:
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combine-tags-by-or
*combine tags by OR
2-sat
binary search
bitmasks
brute force
chinese remainder theorem
combinatorics
constructive algorithms
data structures
dfs and similar
divide and conquer
dp
dsu
expression parsing
fft
flows
games
geometry
graph matchings
graphs
greedy
hashing
implementation
interactive
math
matrices
meet-in-the-middle
number theory
probabilities
schedules
shortest paths
sortings
string suffix structures
strings
ternary search
trees
two pointers
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Problems
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Status
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Custom test
Problems
#
Name
173B
Chamber of Secrets
dfs and similar
,
shortest paths
1800
x3176
172D
Calendar Reform
*special problem
,
number theory
1500
x1402
172C
Bus
*special problem
,
implementation
,
sortings
1500
x1147
171H
A polyline
*special problem
,
implementation
1700
x282
171G
Mysterious numbers - 2
*special problem
1600
x933
171F
ucyhf
*special problem
,
brute force
,
implementation
,
number theory
1600
x1285
168B
Wizards and Minimal Spell
implementation
,
strings
1700
x1223
167B
Wizards and Huge Prize
dp
,
math
,
probabilities
1800
x2170
167A
Wizards and Trolleybuses
implementation
,
math
1600
x2044
166E
Tetrahedron
dp
,
math
,
matrices
1500
x21339
166C
Median
greedy
,
math
,
sortings
1500
x6532
165C
Another Problem on Strings
binary search
,
brute force
,
dp
,
math
,
strings
,
two pointers
1600
x12378
165B
Burning Midnight Oil
binary search
,
implementation
1500
x18227
164A
Variable, or There and Back Again
dfs and similar
,
graphs
1700
x1018
163A
Substring and Subsequence
dp
1700
x2715
162J
Brackets
*special problem
1800
x96
162H
Alternating case
*special problem
1800
x220
162F
Factorial zeros
*special problem
1800
x202
162E
HQ9+
*special problem
1800
x178
162C
Prime factorization
*special problem
1800
x824
162B
Binary notation
*special problem
1800
x313
161D
Distance in Tree
dfs and similar
,
dp
,
trees
1800
x15156
161B
Discounts
constructive algorithms
,
greedy
,
sortings
1700
x1960
160C
Find Pair
implementation
,
math
,
sortings
1700
x3458
159E
Zebra Tower
*special problem
,
data structures
,
greedy
,
sortings
1700
x1001
159D
Palindrome pairs
*special problem
,
brute force
,
dp
,
strings
1500
x4325
159C
String Manipulation 1.0
*special problem
,
binary search
,
brute force
,
data structures
,
strings
1400
x3001
159A
Friends or Not
*special problem
,
greedy
,
implementation
1400
x2485
158C
Cd and pwd commands
*special problem
,
data structures
,
implementation
1400
x9272
156B
Suspects
constructive algorithms
,
data structures
,
implementation
1600
x2234
156A
Message
brute force
1700
x3046
154B
Colliders
math
,
number theory
1600
x4768
154A
Hometask
greedy
1600
x4065
153B
Binary notation
*special problem
1800
x157
153A
A + B
*special problem
1600
x822
152C
Pocket Book
combinatorics
1400
x10677
150B
Quantity of Strings
combinatorics
,
dfs and similar
,
graphs
,
math
1600
x4224
150A
Win or Freeze
games
,
math
,
number theory
1400
x7871
149C
Division into Teams
greedy
,
math
,
sortings
1500
x5405
149B
Martian Clock
implementation
1600
x2264
148D
Bag of mice
dp
,
games
,
math
,
probabilities
1800
x7350
148C
Terse princess
constructive algorithms
,
greedy
1700
x3147
148B
Escape
implementation
,
math
1500
x5514
145B
Lucky Number 2
constructive algorithms
1800
x2221
144C
Anagram Search
implementation
,
strings
1500
x4021
142B
Help General
constructive algorithms
,
greedy
,
implementation
1800
x2220
142A
Help Farmer
brute force
,
math
1600
x2633
141C
Queue
constructive algorithms
,
greedy
,
sortings
1800
x2471
141B
Hopscotch
geometry
,
math
1400
x5408
140D
New Year Contest
greedy
,
sortings
1800
x2217
140C
New Year Snowmen
binary search
,
data structures
,
greedy
1800
x4387
140B
New Year Cards
brute force
,
greedy
,
implementation
1800
x1683
140A
New Year Table
geometry
,
math
1700
x4159
139B
Wallpaper
implementation
,
math
1600
x1311
138A
Literature Lesson
implementation
1600
x2395
137C
History
sortings
1500
x7232
135B
Rectangle and Square
brute force
,
geometry
,
math
1600
x2363
132C
Logo Turtle
dp
1800
x2353
131E
Yet Another Task with Queens
sortings
1700
x1856
131D
Subway
dfs and similar
,
graphs
1600
x4701
131C
The World is a Theatre
combinatorics
,
math
1400
x11230
130J
Date calculation
*special problem
1800
x341
130H
Balanced brackets
*special problem
1600
x606
130G
CAPS LOCK ON
*special problem
1700
x284
130F
Prime factorization
*special problem
1600
x278
130E
Tribonacci numbers
*special problem
1600
x296
130D
Exponentiation
*special problem
1500
x394
130C
Decimal sum
*special problem
1500
x503
130B
Gnikool Ssalg
*special problem
,
implementation
,
strings
1400
x532
128A
Statues
dfs and similar
1500
x3211
126B
Password
binary search
,
dp
,
hashing
,
string suffix structures
,
strings
1700
x19726
125C
Hobbits' Party
constructive algorithms
,
greedy
1600
x932
125A
Measuring Lengths in Baden
math
1400
x2738
124B
Permutations
brute force
,
combinatorics
,
implementation
1400
x3950
123B
Squares
math
1800
x1134
121B
Lucky Transformation
strings
1500
x2578
120H
Brevity is Soul of Wit
graph matchings
1800
x1415
120G
Boom
implementation
1800
x690
120F
Spiders
dp
,
greedy
,
trees
1400
x3627
120E
Put Knight!
games
,
math
1400
x2744
120D
Three Sons
brute force
1400
x1936
118D
Caesar's Legions
dp
1700
x17609
117B
Very Interesting Game
brute force
,
number theory
1800
x1614
115B
Lawnmower
greedy
,
sortings
1500
x2620
114B
PFAST Inc.
bitmasks
,
brute force
,
graphs
1500
x3718
113A
Grammar Lessons
implementation
,
strings
1600
x2304
111A
Petya and Inequiations
greedy
1400
x4795
108B
Datatypes
math
,
sortings
1400
x2471
107B
Basketball Team
combinatorics
,
dp
,
math
,
probabilities
1600
x3520
107A
Dorm Water Supply
dfs and similar
,
graphs
1400
x5122
106D
Treasure Island
brute force
,
implementation
1700
x1364
106C
Buns
dp
1700
x6036
105B
Dark Assembly
brute force
,
probabilities
1800
x820
105A
Transmigration
implementation
1700
x1844
103B
Cthulhu
dfs and similar
,
dsu
,
graphs
1500
x8990
101B
Buses
binary search
,
data structures
,
dp
1700
x2639
100I
Rotation
*special problem
,
geometry
,
math
1500
x351
100G
Name the album
*special problem
,
data structures
,
implementation
1800
x124
100F
Polynom
*special problem
,
implementation
1800
x135
100E
Lamps in a Line
*special problem
,
math
1600
x273
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